The weather protection grid, System 752.5SLC, from MLL Hamburg, is a ventilation grid made of aluminium with a free ventilation cross section of 67%. The system 752.5SLC is equipped with a S-slat of the heavy series of type 050SLC, which in turn is installed in enclosed Frame 702.5 by means of a proven clip technology. The slats fastened with the MLL clip system are also removable afterwards for repair work on on the facade or similar purposes.